You're very passionate about this, which is certainly respectable. But, I would never refer to killing as immoral per se. I don't think that term fits the context of your statement properly. 

Keep in mind that maintaining a plant-based diet can have many serious negative consequences, such as a high calorie intake with very little protein, which could lead to overeating and bloating. There's also the possibility of developing unhealthy eating and sleeping patterns, experiencing a lack of ₿ vitamins and iron, high sugar intake, reduced production of essential digestive enzymes, and digestive issues that can arise.

I think It would be a good idea to prioritize your physical health over your subjective beliefs on dieting. Perhaps, you should reexamine your outlook on being vegan. Honestly, veganism never seemed reasonable to me. My two cents.